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[Python-Dev] Profile Guided Optimization active by-default

Nick Coghlan ncoghlan at gmail.com
Tue Aug 25 08:19:20 CEST 2015 
On 25 August 2015 at 05:52, Gregory P. Smith <greg at krypto.org> wrote:
> What we tested and decided to use on our own builds after benchmarking at
> work was to build with:
>
> make profile-opt PROFILE_TASK="-m test.regrtest -w -uall,-audio -x test_gdb
> test_multiprocessing"
>
> In general if a test is unreliable or takes an extremely long time, exclude
> it for your sanity.  (i'd also kick out test_subprocess on 2.7; we replaced
> subprocess with subprocess32 in our build so that wasn't an issue)

Having the "production ready" make target be "make profile-opt"
doesn't strike me as the most intuitive thing in the world.

I agree we want the "./configure && make" sequence to be oriented
towards local development builds rather than highly optimised
production ones, so perhaps we could provide a "make production"
target that enables PGO with an appropriate training set from
regrtest, and also complains if "--with-pydebug" is configured?

Regards,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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